Means for the application of insulating material in the form of strips to electric conductors



Nov. 18, 1930. DUNSHEATH 11,782,381

mums, FOR THE APPLICA'ZION OF INSULATING MATERIAL IN THE FORM OF STRIPS- TO ELECTRIC convuc'rons Filed April 22, 1930 6 Sheets-Sheet 1 Fig; 2. I

Nov. 18, 1930.

mums FOR THE! APPLICATION OF INSULATING MATERIAL IN THE FORM OF STRIPS T0 ELECTRIC CONDUCTORS Filed April 22. 1930 6 Sheets-Sheet 2- 6 7 Fig. 9.

1O I y e 13 12 26 U 1 Mme/Wm,

P. DUNSHEATH 1 I Nov. 18, 1930. I 'p, DUNSHEATH 1,782,381

IBM FdR THE APPLICATION OF INSULATING MATERIAL IN THE FORM OF STRIPS T0 ELECTRIC CONDUCTORS Filed April 22, 1930 6 Sheets-Sheet 3 Fig-I0.

INVENTOR 197' TOR/Vi" l6 Nov. 18, 1930. p DUNSHEATH 1,782,381

MEANS FOR THE APPLICATION OF msum'rme MATERIAL m was FORM OF STRIPS TO ELECTRIC connuc'rons Filed April 22, 1930 6 sheets-sheet 4 Fig.1 1.

/m I WW'QAJW HTTORNEVS IIEANS FOR run APPLICATION OF INSULATING MATERIAL IN P. DUNSHEATH HIE FORM OF STRIPS TO ELECTRIC CONDUCTORS 6 Sheets-Sheet 5 Filecl April 22, 1930 Nov. 18, 1930. P. DUNSHEATH 3,

MEANS FOR TEE APPLICAJII'ON 0F INSULATING MATERIAL IN THE FORM 0! STRIRS TO ELECTRIC CONDUCTORS Filed April 22, 1950 6 Sheets-Sheet 6 Fig. 13.

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PERCYDUNSEIEATBL or Lennon, nnenaitn, Assrernoa a omas cor-arena, LEMIETED, on Lennon, n ne? as w. air-interns TELEGRAEZH" an, A: BRITISH coMrA v MEA-ns ron rnn arrnicnaion or IImULATIHG'MATERIAL m min romv or s'mrrs i l V TOELEGTRIGCOHDUGTORS Application filed iApritlz a', mac, serial no. 446,368, and in Great m-mm na 10,19 29 This invention relates to apparatus for applying vtoelectric conductors or cablesinsulating inaterial (hereinafter for convenien'ce referred to as paper) in the form of t strips. In suchqa-pparatus thepaper'is led oi-i troin fiat coils which are mounted Ion a rotary carrier which moves them in circles about thegaxis of the conductoror cable and 10 Wrappings onthe conductor or cable (hereinafter for convenience referred to as conductor). I a In orderthat .thezwran ing oi; the conduc uniformity it is; .desirable that certain ad.-

justinlents oi the path of the paper as it comes p p We provide an improved arrangementfor carrying thepaper coils and the jguides onthe conductor should be possible, The

one edge oflthe paper cominences to he Wrappedround the conductor. The first of these adjustments 1s required to take care oi I variations in the diameter or the conductors andthe Width of the strip of paper. The;

second adjustment is required, in order to bythe size, of the coil of paper vvhich of course, varies through a considerable range requirement has been met by the useof a guide round which thepaper passes on the Way from the coil to the conductor. This the appropriate angleofor rapping on the as out above, it is also desirable that certain conditions should he met in apparatusof this character. In this connection it should hepointed out that it is desirable that the paper should conductor Without twist in order to avoid prior arrangements. The presentrapparatusi thereby applies the paper strips as spiral tor may be carriedout With precision and principal adj ustrnents required are I the setting of the angle at which thepa-p'erisled on to the conductor and the setting longitudi-i nally of the conductor, ofthe place at Which {is led on to the conductor and the adjustment get the correct overlap of successive layers. of paper. The arrangement forleading the paper on to the conductor should preferably 1 be such thatthese settings are not influenced "the coil pf paper is made angularly adjust as the paper is removed from it. This last t guide so, placed thatthe stripleayes it at conductor andpasses from it tothe conduce tor in a. plane tangential to the surface of the latter. In addition to the requ rements he led from the coilon to the a I nnequal stressesin the paper strip. Further, the position of the paper-upon the conductor should be determined inirnediatelythe paperis.

passed from the coil round the guide on to the conductor, ithout the necessity for running the mach ne, as is the usual requirelnentin,

provides for these resultsheing ohtained;.

It Willbe understood that asthe paper car- 1 rier is continually rotating round the aXisof the conductor, angles-and planes mentioned in this descrlption must not be taken'a's fixed;

3 in space, butonly as fixed; relation to each other and the axis of the conductor; Ifthe paper carrier be considered as stationary and the conductor as rotating, the planesandan- 3 j gles Would then he fixed in space." i i In accordance iththe present invention whereby amongst other advantages, we obtain the result that the two principal adjustinents above referred to can bemade quite independently of each other, that is to say, the angular adjustment can be made without affecting the position at which the paper ing'xthe angular setting. 5 p

This result is attainedtbyt arranging that of this position canbe made Without disturbv able on a pivot having an axis which is'ton a line radial to the conductor and passes through a point at WlllClitlle strlp of paper makes contact Withthe conductor as it comes from theguide. This point is preferably that at which one edge of the strip makes contact, as this provides a definite reference for use when makingthe setting. It follows from the description given above that the line of the axis of the pivot is located so as to be perpendicular to the plane in which the strip moves When passing from the guide on to the conductor. This guide is carriedon the san'ie mounting as the C011 of paper sothat it turns with it. The axis of the pivot lies at in the plane ofthc edgeoif the, (303i orin diametrical with relation to the coil or even intersect the coil, but itis usually most co-n- 96'" plane parallel-With the edge. It need not be I support which is adjustable in a direction parallel with the axis of the conductor. This support may be carried on a bar parallel with the axis of the conductor and forming part of a rotary frame in which are a number of'similarly placed bars carrying on them a group of coil supports. In an alternative construction the coil supports may be carried on a disc which rotates about the axis of the coinductor and each support may be in the form of a short pillar engaging in a socket in the disc and lying parallel with the axis of the conductor so that the longitudinal adjustment can be obtained by varying the position of the pillar in the socket. The coil-holder is provided with an extension which carries the guide. This is generally in the form of a pin or roller, and the mounting provides for adjustment in a direction parallel with the pivot axis so as to provide for obtaining the lead of the paper on to the conductor in the appropriate plane by an adjustment of the guide to correspond with the diameter of the conductor.

Two forms of construction in accordance with the invention are illustrated as examples in the accompanying drawings, wherein Fig. 1 is a diagrannnatic view in. perspective, illustrating the principle of the inven tion and in which the coil of paper is carried around the cable in a clockwise direction.

2 is a similar view to that shown in Fig. l, the coil, however, being carried round in an anticlockwise direction.

Fig. 3 is an end view of Fig. 2,

Fig. at is a plan view of Fig. 2,

Fig. 5 is a planview of Fig. 2, the coil being viewed from below the cable.

Fig. 6 is a diagrammatic view in elevation showing a modified arrangement 01" the coil and,

Fig. 7 is a plan view of Fig. 6,

Fig. 8 is a plan view of an arrangement suitable for a single coil,

Fig. 9 is a section taken on the line L TX of Fig. 8.

Fig. 10 is a front view of Fig. 8,

Fig. 11 is sectional elevation of a (301k struction suitable for two coils, the l however, being shown for convenience in a non-operative position,

Fig. 12 is a plan view in section of Fig. 11, the coils being shown in an operative position and Fig. 13 is an end view of Fig. 12.

In Figs. 17, 1 represents a coil of paper to be lapped round an electric conductor The coil is carried round the conductor 2. the paper being drawn off the coil and lapped round the conductor, a guide pin or roller 3 being used to guide the paper on to the conductor. The guide is carried in a bracket carrying the coil. so that the guide and coil are rigid with each other, the guide being disposed with its axis parallel to that of the coil. The coil 1 and guide 3 are mounted so as to be adjustable in order to vary the angle at which the paper passes on to the conductor from the guide 3. For this purpose, the coil is mounted upon a pivot, the axis of which is on a line passing through the axis ot the conductor 2 and a point at which the paper makes contact with the conductor as it comes from the guide 3. The axis of the pivot can lie in the plane of either edge oi the coil 1 or in a plane parallel with and lying between these edges. The pivot axis, however, need not intersect the coil, as will be explained hereafter in connection with Figs. 6 and 7. The guide 8 is adjustable so that the plane of the paper it leaves the guide and passes on to the conductor may be maintained at right angles to the line of the axis of the pivot irrespective of the size of the conductor being used. This angle is indicated in Fig. 1 of the drawings. For practical reasons the most convenient positions of the coil and the axis of the pivot are such that the latter lies in the plane oi one edge of the coil and is diametrically arranged in relation to this edge as shown in Fig. 4. In Fig. l the axis I-I of the pivot for the coil passes through the axis of the conductor 2 and also the point where the edge at of the paper meets the conductor. This point is shown more clearly at 5 in Fig. 3. The angular setting may be obtained without disturbing the position of the paper on the conductor, in a longitudinal direction. One advantage of adopting this particular arrangement is that the point 5 in the edge 4: of the paper remains in the same position so that the edge l serves as a convenient reference line when varying the angular setting of the coil with respect to the axis of the conductor. The arrangement also provides for the ready adjustment of a number of coils so that each strip of paper is led on to the conductor at the same angle. In Figs. 6 and 7 the coil itself is arranged to one side of the conductor but is still pivoted about an axis passing through the centre line of the conductor and a point 5 at which the paper coming from the guide 3 meets the conductor. The guide is adjustable in each case to permit the appropriate angle to be maintained between the plane of the paper and the line of the axis of the pivot and the paper passes without twist from the coil around the guide on to the conductor. The particular arrangement of the coil axis as described above also has the advantage of avoiding any tendency for the paper to wander on the conductor. Independent arrangements which will be described later are also provided to permit the coil to bcinoved axially the conductor. The coil may be carried around the conductor in either a clockwise or anticlockwise direction as indicated by the arrows in Figs. 1 and 2.

It is often desirable to mount two coils side by side upon common hubor spindle. 111i an arrangement, of this character, an approxi- .mat onyto the results obtained. above may be el'lected by i arranging the pivot in relation to oneof the. coils as described above andproviding means for moving theother coil. towards thefirst coil in order to compensate for theaxial movementalong the conductor,

of the second coilafter an angular adjust:

i of the bolts 11. Abracket12 passesthrough ment has been made.

described in more deta lbelow.

' ably mounted.

upon a screw 27 which can berotated by a handle 28 in order to bring the guide pin This arrahgemei'it is Referring'jnow to Figs. 8-10, thecoil 1 Y is mounted between a pair of plates 6, 7. The

coil is secured to a centre 8 and is mounted upon a boss 9 forming partof the plate 7. The

latter is secured to the support 10 by means the support 10 and has a pivot 13 about which the coil 1 can be adjusted, for this purpose.

the will has beengiven its proper angular setting the support 10 and. bracket 12 may be. secured together by a lock nut 21. The plate 6 is rotatably mounted upon a sleeve 22 which fits on to a boss 23 forming part of the fixed plate The plate 6 is held in position by a spring 21, the pressure of which is adjustable by a nut 25. The plate 7 has a bracket 26 in which aguide pin 3 is adjust- The guide pin is mounted into position such that thepaper passes tangentially on to the conductor 2. The bracket 12 is carried upona bar 29 and the position of the coil 1 can be adjusted axially of the conductor by moving the bracket 12 along the bar 29. The bracket 12can be locked to the bar 29 by a nut'30. The plate 7 may be provided with a felt washer. 31. In operation the whole. device is carried round the con-' ductor 2, the plate 6 rotating with the coil but the plate 7 remaining stationary to pr0 vide the necessary friction upon the coil as the latter is unwound. Itwill be seen from 'Fig. 9 that the axis of the pivot 13 passes through one edge'of the coil and through a point at which the corresponding edge of the paper meets the conductor. The plate 18 may i have a scale 31 for convenience in obtaining the required angular adjustment of the coil.

In Figs. 11-13 a coil. of paper 1 and a sec- 0nd coil 32 are both carried on a hollow hub 33. Each coil is provided witha centre 8 and is free to rotate upon a bush 34. The

coils aredisposed between. plates 35 and 36 which, in this case, are in the form of star shaped battens seen in Fig. 13. The bracket 12has a pivot 13 about which the hub 33 is angularly adjustable by means of a worm 14 and segment 15. j The hub 33 has secured to it a; dependent bracket 26 provided with a guide pin. 3', the latter serving to guide the two paper strips onto the conductor 2. It will beseen ijromFig. 11 that the aXis'of the pivot pin is disposed substantially in the plane of one edgeof the coil 1. In order to provide for the axial movement of the paper coming from the secondcoil relatively tot-he conductor 2,the screw 37 operated by a handle 38, isadapted to slide. the coil .32 along the hub33. Thexscrew 37 passes through .anadjustable stop 39. which bears against ring 40. 'Slotjs Aglare formed inthe hub 33 through which thestop 39 projects so that it can bearagainst, the ring 40. The

hub 33 is'screw threaded atj42toaccommo datenuts 43 which bearagainst r'ings 44 keyed to the hub 33. The necessary frictional restraint. against the; rotation of i the coils 1 and 32 isobtained by the nuts 43jand a spring 45; against which latterthe {ring 49 bears. Whenthe nuts 43 are slackened oil and the screw 37 rotated in the appropriate direction the coil "32 is moved outwardly on the hub133. Byrotatingthe' screw 37 in the opposite direction the-"stop 39 comes out of contact with the ring 40 and the nut 43 can then be rotated to bring the coili 32 nearer to the coil 1. By this means the a xial move- I tively tothe conductor ment ot the coil 32rela can be; compensated -for.- i i l To provide for the axial movement ofthe complete head the bra cket 12 is carried back and 'ispsupported by a rotatably lllOllIltQCh disc 46. The rearwardly extending portion of the b jacket 12 is provided with a screw 47 operated byahandle 48.1" The screw 47 passes through a screwthreaded portion 49 of a bracket'50 and rotation of the screw causesthebracket 12 to slide relatively to the disc {l6 so as to move the two coils longitudinally ofthe conductor 2. As thedisc 46 rotates the axis of the: conductor, it carries 1 I round with it the coils lf and Adjust- 1 ability of the guidepin 3'is provided for i as in; the previous case, by a screw 27 upon which the guide pin 3. is mounted, gearing 49and an operating handle 28. What I claim as my invention and desire to secure. by Letters Patent is i 1. Apparatus for applying material in the.

form of strip to an electric conductor, comprising a carrier for a flat coil ofthe material, a guide round which the strip passes from thecoil to the conductor, means for supporting said carrier and guide injfixed relation to each other and rotatable about the conductor], said supporting means compris ing a pivotalmounting of the C011 and guide roviding ad'ustment of their o ositionsbv P turning about an axis which is radial to the conductor and which passesthrough a point at which. the strip. makes contact with the conductor as it comes from the guide.

2. Apparatus for applying material in the form or" strip to an electric conductor, comprising a carrier for a lat coil of the material a guide round which the strip passes from the coil to the conductor, means torsupporting said carrier and guide in fixed relation to each other and rotatable about the conductor, said supporting means comprisin a pivotal mounting of the coil and guide providing adj ustmcnt of their positions by turning about an axis which passes through the axis of the conductor and through a point at which one edge of thestrip coming from the guide makes contact with the conductor and lies in the plane of the corresponding edge of the coil and passes through the axis of the coil.

3. Apparatus for applying material in the form of strip to an electric conductor, comprising a carrier for a flat coil of the material, a guide round which the strip passes from the coil to the conductor, means for supporting said carrier and guide in fixed relation to each other and rotatable about the conductor, said supporting means comprising a pivotal mounting of the coil and guide providing adjustment of their positions by turning about an axis which is radial to the conductor and which passes through a point at which the strip makes contact with the conductor as it comes from the guide, said supporting means also comprising means for adjusting the position of the guide relative to the carrier so as to provide for the angle between the plane of the strip as it moves between the guide and the conductor and the axis of pivoting aforesaid being made a right angle for all sizes of the conductor.

4. Apparatus for applying material in the form of strip to an electric conductor, comiprising two coaxial carriers for fiat coils of strip material and a guide round which the strips pass from the coils to the conductor, means for supporting said carriers and guide in fixed relation to each other and rotatable about the conductor, said supporting means comprising means for pivotally mounting the carriers and guide for adjustment about an axis which is radial to the conductor and passes through a point at which one of the strips makes contact with the conductor as it comes from the guide, and means for moving the carrier, for that strip which is not intersected by the axis of the pivot, axially relative to the other carrier to compensate for the axial movement 01 its strip relative to the conductor when an angular adjustment of the Carri r is made.

5. apparatus for applying material in the "Form of strip to an electric conductor comprising two carriers for flat coils of strip material, a hub supporting the two carriers, one of said carriers being fixed in axial position on said hub and means being provided within the hub for adjusting the other of said carriers, a guide round which the strips pass from the coil carriers to the conductor, means for supporting said hub and said guide in fixed relation to each other and rotatable about the conductor, said supporting means comprising means for angularly adjusting 

